路由器是常用的网络______设备。
参考答案：互联(或连接或通信)
Many students believe the choice of their courses and universities should _______their own interest.
A．be based on
B．base on
C．basing on
D．base at
一个控制系统比较理想的动态过程应该是（）
A.衰减振荡
B.等幅振荡
C.发散振荡
D.非周期过程
